Large-scale cosmic microwave background anisotropies in isocurvature baryon open universe models

Abstract

view Abstract Citations (29) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Large-Scale Cosmic Microwave Background Anisotropies in Isocurvature Baryon Open Universe Models Gorski, Krzysztof M. ; Silk, Joseph Abstract We calculate the large angular scale cosmic microwave background anisotropy in a low-density baryon-dominated universe with isocurvature primordial inhomogeneities. In models in which the initial power spectra of perturbations are steeper than white noise, P(k) is proportional to k^n^, n < 0, predictions for the quadrupole moment of the anisotropy are found to be in conflict with existing observational limits, if the universe remained fully ionized and Compton drag inhibited growth of inhomogeneities until z ~ 100. In order to lower the amplitude of the anisotropy, one has to substantially prolong the duration of the growth phase of density perturbations, while smearing out fine-scale anisotropies, thereby requiring reionization to occur at a redshift smaller than 100, but larger than the redshift of the last scattering surface (in a reionized model). A definitive test will require measurement of large angular scale anisotropy to a level σT/T ~ 3 x 10^-6^. Publication: The Astrophysical Journal Pub Date: November 1989 DOI: 10.1086/185564 Bibcode: 1989ApJ...346L...1G Keywords: Anisotropy; Baryons; Perturbation Theory; Relic Radiation; Compton Effect; Computational Astrophysics; Universe; White Noise; Astrophysics; COSMIC BACKGROUND RADIATION; COSMOLOGY full text sources ADS |